Personal history of allergy to unspecified medicinal agent

This code indicates a patient's past adverse reaction to a medication, where the specific drug or drug class causing the allergy is not documented or is unknown. It signifies a history of hypersensitivity to a pharmaceutical agent without identifying the precise allergen.

Use this code when a patient reports a prior allergic reaction to medication, but the medical record lacks details about the specific drug involved. This is appropriate for documenting a general medication allergy history when more specific information is unavailable or not yet determined.

• Always strive for a more specific allergy code if the medicinal agent is known (e.g., penicillin, sulfa).
• This code should be used when the documentation explicitly states "allergy to unspecified medicinal agent" or "medication allergy, unknown type."
• Do not use this code for adverse effects or intolerances that are not true allergic reactions.